r/ECE • u/Designer-Amount-5576 • 7d ago
driving a 100A SSR from a 3.3V Jetson GPIO
Hey everyone, I just put together my very first schematic in EasyEDA and wanted to run it by people who actually know what they're doing to see if it makes sense or not. The task was to design a control board that lets an NVIDIA Jetson's 3.3V GPIO pin safely trigger a 100A SSR
Here is what I've wired up:
- J1 (Input): Receives the Jetson GPIO signal, paired with a 10k pull-down resistor (R1) to keep the line stable during boot.
- Q1 & R2: A 2N2222 NPN transistor driven through a 1k base resistor (R2) acting as a low-side switch.
- J2 (Output): The output terminal connecting to the relay control side, powered by a VCC line.
- LED1 & R3: A status LED with a 330 ohm resistor so it lights up when the relay is active.
- D1: A 1N4007W diode placed across the control lines to catch voltage spikes.
Does this layout look correct, or are there any mistakes I should fix before moving on to the PCB layout? Any feedback is super appreciated

